Darth Vader
Darth Vader emerged in 1977 with the release of the original Star Wars film. The character has maintained cultural presence for approximately five decades, a remarkable achievement for any fictional construct. However, this longevity depends entirely upon continued corporate stewardship and audience interest in the franchise.
Analysis of fictional character lifecycles suggests that even iconic figures experience diminishing relevance over sufficient timescales. Without active media production and marketing investment, Vader faces the same entropy of attention that has claimed countless previous cultural phenomena.
Procrastination
Procrastination predates recorded history. Archaeological evidence suggests that early human settlements experienced the phenomenon, with grain storage patterns indicating delayed agricultural decision-making. Greek philosopher Hesiod documented procrastination in the 8th century BCE, whilst the behaviour likely accompanied Homo sapiens throughout the species' entire existence.
The neurological substrates responsible for procrastination appear hardwired into mammalian brain architecture. Unless significant evolutionary pressure eliminates the tendency, procrastination will likely persist for as long as humans retain their current cognitive configuration.